FT-2bgmw.consrv.ca.gov/SHP/APSI_SiteInvestigation... · 5/29/2007 · by pebble lineation and...
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PETRA GEOTECHNICAL, INC. 42-240 GREEN WAY, SUITE E PALM DESERT, CALIFORNIA 92211 PHONE: (760) 340-5303 COSTA MESA MURRIETA PALM DESERT SAN DIEGO SANTA CLARITA DATE: J.N.: DWG BY: SCALE: G GRAPHIC SCALE (in feet) HORIZONTAL=VERTICAL 0 20 PLATE 7 Trench Logs: FT-2b to FT-2d 645-05 See above May 2007 LAW/WBS 746-Acre Stone Water Project Van-Cal Properties Riverside County, CA FT-2b FT-2c FT-2d Sta 0 (in feet) 20 40 60 80 100 120 140 160 180 200 220 240 260 Sta 0 (in feet) 20 40 60 80 100 120 140 160 180 200 220 240 260 Sta 270 (in feet) 250 230 210 190 170 150 130 110 90 70 50 30 10 0 East West Qf 3U+L : Loose, light gray to gray brown coarse sand and pebble/cobble conglomerate, generally well bedded. Qb surface incised with Qa channels. Qf 1 Qf 4 N58E N63E Qf 3U+L Qf 3U+L Qf 4 Qf 5 Qf 4 contact logged as seen on North Wall. Qf 5 FAULT: Inactive fault, does not offset Late Pleistocene unit. Qf 5 : Weakly cemented, friable, light brown/gray brown cobble conglomerate and interbedded coarse sand. Few weathered dioritic clasts within CaCO 3 coating. Qf 4 : Light reddish brown silty to well sorted coarse to very coarse sand and pebble conglomerate, friable, loosely cemented. One CaCO 3 pipe noted in N wall at STA 98. Massive to coarsely bedded, CaCO 3 coating on some of the larger clasts. Qf 2+3U East West N75E SE Wall N65E SE Wall Qf 2+3U Qf 3L : Contact with Qf 3U marked by gray brown, pink brown silty sand and coarsely graded pebble conglomerate. Qf 3L varies from coarse, massive, pebbly sand to poorly sorted cobble conglomerate (massive). Qo: Massive, red brown cobble/boulder conglomerate with coarse, gritty poorly sorted red brown sand matrix. Numerous grussified dioritic clasts coated with CaCO 3 . Also characterized by massive pebble conglomerate with coarse sand matrix moderate to weakly cemented. FAULT: N28W/80SW Fault in Qo, no offset of Qf 3L . Fault manifested in Qo by pebble lineation and fracturing, truncation of cobble and sand bed. Fracturing of Qf 3L and Qf 3U extend to ~2' from surface. Inactive fault, does not offset Late Pleistocene unit. FAULT: N20W/85NE ~3" apparent vertical offset of Qf 3U /Qf 3L contact across zone. Extension or lateral movement accounts for Qf 3L 10" keyed into fault zone. Qf 3U soil also downdropped ~6". Potentially active, needs further study. Qo Qf 3L : Contact with Qf 3U marked by gray brown to pink brown silty sand and coarsely graded pebble conglomerate. Qf 3L varies from coarse, massive, pebbly sand to poorly sorted cobble conglomerate (massive). Qf 2 Qf 3U Qf 3L Qo Qf 1 Weak B W , not an A V horizon associated with older surface. Qb surface Qc surface Qf 2 /Qf 3U contact gradational, not distinct. Qf 3U : Light gray brown to slightly reddish brown coarse, well bedded sand and pebble conglomerate. Fracture: No offset observed in Qf 3L . Fracture dies out within Qf 3L at depth. Qf 3U+L Qf 4 Qf 6 : Reddish brown conglomerate with silty very coarse to coarse sandy matrix. Possible Qf 5 : Dirty pebble conglomerate. Qf 2 B W Afu Qf 2 Friable sandy conglomerate. Carbonate pipe Afu Holocene age soil; A V horizon: 1.0" thick 1/4 - 1/2" gray vesicular overlying 1/2" pink. Qc surface Qa Qd surface Qf surface Qf 3L : Silt and carbonate indurated zone, dense. Iron oxide lamellae and silt at base of unit. Likely older member of Qf 3 . Minimum Qc surface. Afu Weak carbonate pipe 2" into Qf 3L . Afu Qf 2 ? Active channel Colluvium N14W N14W N18W N18W Qf 3L Carbonate pipe Qf 4 at surface: Likely old surface of Qf 4 eroded, then soil formed. Qf 3L Qf 3U : Friable, gravelly sand, poorly bedded, very weak lamellae. A V : 1 - 1.5" thick, 1/4" gray vesicular, 1/2 - 3/4" pink. B W : 10 - 11" thick, yellowish brown secondary silt, silt coated carbonate conglomerate at base of B W . Afu: Fill cap to protect soils. Qf 3U : A V : 1.0", some spots 1.5". B W : 3 - 4" thick, iron oxide staining, minor secondary silt. Colluvium Vertical carbonate pipe, weak. Qaf Qf fan surface soil: A V : 3 - 4", same translocation of clay films, sub-argillic, B T horizon. Qf 6 min: Sandy conglomerate, highly friable and iron oxidized clasts, fining upwards sequence. Well bedded sands, reddish brown silty conglomerate. Late Pleistocene soil and distinct deposit. Likely Qo, possibly some Qf 6 . But the soil is Qf surface age - Qo. Qo Carbonate pipe cut off. Qf 4 or reddish brown colluvium. Fill from previous trench (Hilltop 2004). Qo Qf 4 : Gravelly sand, light yellowish brown (10YR 2/4), dry, medium dense. Very well bedded, open channels, numerous iron oxide lamellae, unit has submembers that show increased reddening and induration with depth. K horizon: Abundant carbonate and silt in conglomerate. Qo Qf 3U+L : 3 members, likely all part of Qf 3 , units are different by increased yellowing and induration, increased lamellae. Qo Qf 4 : Buried soil Late Pleistocene unit. Possible location for soil age of Qf 4 . Qf 5 : Pebble conglomerate, silt-coated clasts. Massive debris flow. Qf 4 : Reddish brown conglomerate with moderately well bedded coarse sand members. Silty very coarse to coarse sandy matrix, vertical carbonate pipes common, horizontal carbonate zones and silt coated zones. Qf 3L : Sandy conglomerate, moderately friable, 1/3 dioritic and 2/3 leucocratic, dioritic not weathered to gruss, iron oxide plus silt laminations along base of open channels. Qo: Abundant carbonate coated boulders. Qf 4 Qf 3L : Unit has submembers that show increased yellowing and induration with depth. Connecting point with FT-2a @ ~ Sta. 700'. Southeast Qb cut terrace surface.
Transcript of FT-2bgmw.consrv.ca.gov/SHP/APSI_SiteInvestigation... · 5/29/2007 · by pebble lineation and...
PETRA GEOTECHNICAL, INC.42-240 GREEN WAY, SUITE E
PALM DESERT, CALIFORNIA 92211PHONE: (760) 340-5303
COSTA MESA MURRIETA PALM DESERT SAN DIEGO SANTA CLARITA
DATE: J.N.:
DWG BY: SCALE:
G
GRAPHIC SCALE(in feet)
HORIZONTAL=VERTICAL
0 20
PLATE 7
Trench Logs: FT-2b to FT-2d
645-05
See above
May 2007
LAW/WBS
746-Acre Stone Water ProjectVan-Cal PropertiesRiverside County, CA
FT-2b
FT-2c
FT-2d
Sta 0(in feet)
20 40 60 80 100 120 140 160 180 200 220 240 260
Sta 0(in feet)
20 40 60 80 100 120 140 160 180 200 220 240 260
Sta 270(in feet)
250 230 210 190 170 150 130 110 90 70 50 30 10 0
EastWest
Qf3U+L:Loose, light gray to gray brown coarsesand and pebble/cobble conglomerate,generally well bedded.
Qb surface incised with Qa channels.
Qf1 Qf4
N58E N63E
Qf3U+L
Qf3U+LQf4Qf5
Qf4 contact loggedas seen on North Wall.
Qf5FAULT:Inactive fault, doesnot offset LatePleistocene unit.
Qf5:Weakly cemented, friable, lightbrown/gray brown cobble conglomerateand interbedded coarse sand. Fewweathered dioritic clasts within CaCO3coating.
Qf4:Light reddish brown silty towell sorted coarse to verycoarse sand and pebbleconglomerate, friable, looselycemented. One CaCO3 pipenoted in N wall at STA 98.Massive to coarsely bedded,CaCO3 coating on some ofthe larger clasts.
Qf2+3U
East WestN75E
SE Wall N65ESE Wall
Qf2+3U
Qf3L:Contact with Qf3U marked by graybrown, pink brown silty sand andcoarsely graded pebble conglomerate.Qf3L varies from coarse, massive,pebbly sand to poorly sorted cobbleconglomerate (massive).
Qo:Massive, red brown cobble/boulderconglomerate with coarse, gritty poorly sortedred brown sand matrix. Numerous grussifieddioritic clasts coated with CaCO3. Also characterizedby massive pebble conglomerate with coarse sandmatrix moderate to weakly cemented.
FAULT: N28W/80SWFault in Qo, no offset of Qf3L. Fault manifested in Qoby pebble lineation and fracturing, truncation ofcobble and sand bed. Fracturing of Qf3L and Qf3Uextend to ~2' from surface. Inactive fault, does notoffset Late Pleistocene unit.
FAULT: N20W/85NE~3" apparent vertical offset of Qf3U/Qf3Lcontact across zone. Extension or lateralmovement accounts for Qf3L 10" keyed intofault zone. Qf3U soil also downdropped ~6".Potentially active, needs further study.
Qo
Qf3L:Contact with Qf3U marked bygray brown to pink brownsilty sand and coarsely gradedpebble conglomerate. Qf3L variesfrom coarse, massive, pebblysand to poorly sorted cobbleconglomerate (massive).
Qf2Qf3U
Qf3LQo
Qf1
Weak BW, not an AVhorizon associatedwith older surface.
Qb surface
Qc surface
Qf2/Qf3U contactgradational, notdistinct.
Qf3U:Light gray brown toslightly reddish browncoarse, well beddedsand and pebbleconglomerate.
Fracture:No offset observed in Qf3L. Fracturedies out within Qf3L at depth.
Qf3U+LQf4
Qf6:Reddish brownconglomerate withsilty very coarseto coarse sandymatrix.
Possible Qf5:Dirty pebble conglomerate.
Qf2BW Afu Qf2
Friable sandy conglomerate.
Carbonatepipe
Afu
Holocene age soil;AV horizon:1.0" thick 1/4 - 1/2"gray vesicularoverlying 1/2" pink.
Qc surface Qa Qd surface Qf surface
Qf3L:Silt and carbonateindurated zone, dense.Iron oxide lamellae andsilt at base of unit. Likelyolder member of Qf3.Minimum Qc surface.
Afu
Weak carbonatepipe 2" into Qf3L.
Afu Qf2?Active channel Colluvium
N14W N14W N18W N18W
Qf3L
Carbonate pipe
Qf4 at surface:Likely old surfaceof Qf4 eroded,then soil formed.
Qf3L
Qf3U:Friable, gravelly sand,poorly bedded, veryweak lamellae.
AV: 1 - 1.5" thick, 1/4" gray vesicular, 1/2 - 3/4" pink.BW: 10 - 11" thick, yellowish brown secondary silt,silt coated carbonate conglomerate at base of BW.
Afu:Fill cap toprotect soils.
Qf3U:AV: 1.0", some spots 1.5".BW: 3 - 4" thick, iron oxidestaining, minor secondary silt.
ColluviumVertical carbonatepipe, weak.
Qaf
Qf fan surface soil:AV: 3 - 4", same translocation of clayfilms, sub-argillic, BT horizon.
Qf6 min:Sandy conglomerate,highly friable and ironoxidized clasts, finingupwards sequence.Well bedded sands,reddish brown siltyconglomerate.Late Pleistocene soiland distinct deposit.
Likely Qo, possiblysome Qf6. But the soilis Qf surface age - Qo.
QoCarbonate pipecut off.
Qf4 or reddishbrown colluvium.
Fill from previoustrench (Hilltop 2004).
QoQf4:Gravelly sand, light yellowish brown(10YR 2/4), dry, medium dense. Verywell bedded, open channels, numerousiron oxide lamellae, unit has submembersthat show increased reddening and indurationwith depth.
K horizon:Abundantcarbonateand silt inconglomerate.
QoQf3U+L:3 members, likely allpart of Qf3, units aredifferent by increasedyellowing and induration,increased lamellae.
QoQf4:Buried soil LatePleistocene unit.Possible locationfor soil age of Qf4.
Qf5:Pebble conglomerate,silt-coated clasts.Massive debris flow.
Qf4:Reddish brownconglomeratewith moderately wellbedded coarse sandmembers. Silty verycoarse to coarsesandy matrix,vertical carbonatepipes common,horizontal carbonatezones and silt coatedzones.
Qf3L:Sandy conglomerate, moderatelyfriable, 1/3 dioritic and 2/3 leucocratic,dioritic not weathered to gruss, ironoxide plus silt laminations alongbase of open channels.
Qo:Abundant carbonatecoated boulders.Qf4
Qf3L:Unit has submembersthat show increasedyellowing and indurationwith depth.
Connecting pointwith FT-2a @ ~ Sta. 700'.
Southeast
Qb cut terrace surface.
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